class_docstr: Python wrapper for the pre execution hook output message.
class_docstr_tok: ["Python","wrapper","for","the","pre","execution","hook","output","message","."]
code: def encode(self) -> execution_hook_pb2.PreExecutionOutput:
      raise NotImplementedError
  
file_path: tfx/tfx/dsl/hooks.py
imports: import abc
  from typing import Optional, Union
  import attr
  from tfx.orchestration import data_types_utils
  from tfx.proto.orchestration import execution_hook_pb2
  from ml_metadata.proto import metadata_store_pb2
label_desc: Use image node_id 1 for calling the PreExecutionOutput obj's underlying member method code with example usage: obj.encode() without return types